The Liverpool ace has been outstanding in England's two Euros games.
Vieira told the Daily Mail: "As a manager, or if you are one of the players, you are looking for a leader in the team - someone to show you the way. Steven Gerrard is the main man for England.
"To come back from a losing situation against Sweden was important. It creates something strong in the group because they have proved to themselves it is possible to win from that position."